IV20173: FIELDS APPEAR TO BE INCOMPLETELY INITIALIZED IN OBJECT CREATED B Y ANOTHER THREAD

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APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
    .
    Stack Trace: N/A
    .
    

Local fix

  • -Xjit:disableAllocationSinking
    

Problem summary

  • An optimization called allocation sinking moves object
    allocations downward in the code.  On PPC is can also sink the
    corresponding memory flush instruction.  However, there was a
    subtle bug in the opt which could cause it to sink an unrelated
    flush.  That means an unrelated allocation can have its flush
    delayed, opening up a small window where another thread could
    see the allocated object in an uninitialized state.
    

Problem conclusion

  • This defect will be fixed in:
    7.0.0 SR2
    6.0.1 SR3
    .
    The opt was fixed so it only sinks the correct flush.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV20173

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-04-24

  • Closed date

    2012-05-04

  • Last modified date

    2012-09-06

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    JIT

  • Fixed component ID

    620700124

Applicable component levels

  • R260 PSY

       UP



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Document information


More support for:

Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version:

260

Reference #:

IV20173

Modified date:

2012-09-06

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